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Pics of my Stihl MS290 and 039 Muffler Mods with Questions

Discussion in 'Chainsaw' started by Gareth83, Feb 26, 2011.

  1. Gareth83

    Gareth83 ArboristSite Operative

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    Hi all,

    been a while since I've been on here last and back then I only had a Husqvarna 44. I got the bug and have since bought the following;

    Jonsered 535
    Stihl 041 AV
    Stihl MS290
    Stihl 039

    I decided to muffler mod the MS290 and 039 even though I've only had them for a week.

    So here's my pics:

    [​IMG]

    The muffler before I modded it:

    [​IMG]

    I decided to open up the existing holes:

    [​IMG]

    I then opened them up further:

    [​IMG]

    I then opened up the cover and removed the limiters:

    [​IMG]

    The questions I have are as follows:

    1. Has the muffler cover been modified too greatly, should I have done it differently? If so I can get a new cover but how should I do it?
    2. I am yet to start up the saw, what initial carb settings should I try?
    3. What paint should I use to just give it the once over?

    Hopefully will have them both running tomorrow

    Thanks
     
    Last edited: Feb 26, 2011
  2. nmurph

    nmurph ArboristSite.com Sponsor

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    you need more opening.
    start with the settings at 1 1/4 turn ea and tune from there.

    [​IMG]

    [​IMG]
     
    Last edited: Feb 26, 2011
  3. Gareth83

    Gareth83 ArboristSite Operative

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    surely yours is restricted by the cover?

    mine is about 80% of cylinder port area

    isn't 1 1/4 for both excessive seen as stock for H is 3/4 and L is just 1/4?
     
    Last edited: Feb 26, 2011
  4. Gareth83

    Gareth83 ArboristSite Operative

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    Well the 039 flies with a 15" bar and new RSC chain!!
     
    oscar4883 likes this.
  5. JDNicol

    JDNicol ArboristSite Guru

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    That is the standard setting with limiter caps in place, not having been removed.
    The suggested stanard setting having removed the limiter caps is 1 turn out on each but i find 1 1/4 turns out on each is a safer bet, adjust then re-install the caps.

    Also it would appear you have the illusive flippy capped 029S/039. I do not believe it is a frankensaw, notice the different flippy caps. What is the date on the silver sticker?
    I started a thread on this;
    http://www.arboristsite.com/chainsaw/160526.htm
     
  6. Gareth83

    Gareth83 ArboristSite Operative

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    The MS290 is 2005 the 039 is 2000
     
  7. nmurph

    nmurph ArboristSite.com Sponsor

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    i have several saws running at 100% without problem. yes, you lose some effectiveness due to the deflector. it will run cut for cut with a stock 310.
     
  8. Gareth83

    Gareth83 ArboristSite Operative

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    Can anyone advise as to whether the MS290 and 039 have the same carb aside from limiter caps? The 039 was playing up today after felling a few trees and I guess it may need a carb rebuild / fuel hoses replacing.

    In the interim can I use the MS290 carb on the 039?

    Thanks
     

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